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United are confident they can land Costa this summer, with the Reds said to have received sufficient encouragement following an initial enquiry about the potential availability of the player.

Although Juventus have an option to sign Costa on a permanent basis as part of their loan agreement with Bayern, they may ultimately decide not to take that up, leaving United free to step in and land him.

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Mourinho claimed he would not be in the market for attacking players this summer following the January arrival of Alexis Sanchez from Arsenal on a whopping £500,000-a-week.

But Sanchez has struggled since joining United, while there question marks over the futures of Anthony Martial and Juan Mata, meaning Mourinho is now pursuing attacking targets this summer.

Striking troubles

Alexis Sanchez's struggles have been clear for all to see since he joined Manchester United.

The 29-year-old joined the Red Devils from Arsenal in January, in a deal that makes him the Premier League’s best-paid player.

But things haven’t run smoothly for the former Barcelona star, with Sanchez scoring just once in ten games following his switch.

His performances have come under close scrutiny and the Chilean was left on the substitutes’ bench for the FA Cup quarter-final win over Brighton last weekend.

According to The Sun, at half-time of the Champions League embarrassment at the hands of Sevilla, United players rounded on Sanchez and tore into the 29-year-old.

Teammates let rip at him, with claims they were unhappy with his failure to track back when United lost possession and that he plays the game only on his terms - not covering for teammates caught out of position, reports the Mirror.

Additionally, he was reminded that his performances needed to be greater at Old Trafford than they ever were at The Emirates.

However, it's alleged that it was met with little response, other than a shrug of the shoulders.

Sanchez had little impact against the Spanish side as United were dumped out of Europe.

And the Chilean was subsequently dropped from the starting lineup for the FA Cup quarter-final win over Brighton, remaining on the bench throughout.

Earlier this week Sanchez admitted he had expected more from himself in his opening two months at United.

"As I am self-demanding, I expected something better," said Sanchez. "After my arrival at United, it was hard to change everything very quickly. I even hesitated to come here [to Sweden, with the national team].

"I had asked permission to miss these games, but then I thought better and spoke with Claudio [Bravo] and told him that we should all be united.

"The change of club was something that was very abrupt - it was the first time I've changed clubs in January - but many things have happened in my life that are difficult."